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| Home > Publications database > Beam Cooling at COSY and HESR Theory and Simulation – Part 1 Theory |
| Home > Publications database > Beam Cooling at COSY and HESR Theory and Simulation – Part 1 Theory |
| Book | FZJ-2016-02157 |
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2016
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-127-9
Please use a persistent id in citations: http://hdl.handle.net/2128/10160
Abstract: The intention of the theory part of the book is to outline a comprehensives and contiguous description of the stochastic cooling theory which is applied in the cooling simulations to predict the beam properties in internal target experiments at COSY and HESR. The cooling formalism is extended to include the beam-target interaction. The latter is discussed in more detail in chapter 4. The simulations and momentum cooling experiments at COSY with internal targets demonstrate that the mean energy loss due to the beam-target interaction cannot be compensated by a momentum cooling application alone. Instead, an h = 1 rf-cavity or a barrier bucket cavity is mandatory to compensate the mean energy loss, specifically for thick targets as they are envisaged in the PANDA experiment at the HESR. Beam dynamics experiments at COSY have proven that stochastic momentum cooling with simultaneously barrier bucket operation behaves similar to stochastic cooling of a DC beam and therefore constitutes the preferable method to compensate the mean energy loss successfully. To investigate the cooling experiments theoretically the Fokker-Planck approach of 1-dimensional momentum cooling as outlined in chapter 2 has been extended to include the beam-target interaction under the assumption that the mean energy loss is compensated. Intrabeam scattering (IBS) caused by small-angle Coulomb scattering in a charged beam is incorporated with an additional diffusion term (chapter 5). Stochastic betatron cooling is described in chapter 3. The rate equations are extended so as to include the small-angle Coulomb scattering due to the beam-target interaction which leads to a transverse emittance growth with time. The authors have investigated the beam cooling process in the HESR for these several years, developing the cooling theory and the simulation code and frequently performing the experiment at the COSY to confirm the simulation results and benchmark the computer code. After the intensive work it is now concluded that the stochastic cooling is able to attain the high resolution antiproton beam for the energy range 1 to 14 GeV and will meet the requirements for internal target experiments with heavy ions too. The aim of the theory part of the book is to present a detailed derivation of the longitudinal and betatron stochastic cooling formalism which is applied in part 2 of the book to determine the cooling predictions for COSY or the HESR including internal targets and Intrabeam Scattering. The derivation includes the beam-target interaction formalism. [...]
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